Metal-Coated Polymer Bridge for Electrical DNA Sequencing
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Solution Overview
Problem
Current sequencing technologies, such as those using fluorescence-based detection, are complex, time-consuming, and costly due to the need for optical components, which limits their efficiency and scalability in sequencing polynucleotides like DNA.
Innovation Solution
The use of metal-coated polymers with electrodes and an exposed region allows for sequencing by detecting changes in electrical signals as nucleotides are added, utilizing metal-coated regions for stable contact and an exposed region for label interaction, enabling robust, real-time, and high-throughput sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-based detection is used for sequencing, then detection capability is achieved, but device complexity and cost increase due to optical components
Solution Approach 1:
The patent replaces the optical detection system (fluorescence-based detection with excitation light sources and imaging devices) with an electrical detection system. Specifically, it uses a conductive polymer bridge with electrodes that detects nucleotide incorporation through changes in electrical current or impedance, eliminating the need for complex optical components while maintaining detection capability
Solution Approach 2:
The invention changes the detection parameter from optical (fluorescence) to electrical (current or impedance). By measuring electrical properties of the conductive polymer bridge that change when nucleotides are incorporated, the system achieves sequencing detection without requiring optical excitation and imaging equipment
2Productivity
If fluorescence-based sequencing is used, then sequencing can be performed, but time consumption increases
Solution Approach 1:
The replacement of optical detection with electrical detection accelerates the sequencing process. Electrical measurements can be performed rapidly and continuously without the time-consuming steps of optical excitation, image acquisition, and processing, thereby reducing overall time consumption while maintaining or improving throughput
3Measurement precision
If metal-coated polymer bridge is used, then electrical signal detection is enabled, but manufacturing complexity increases
Solution Approach 1:
The polymer bridge is segmented into distinct functional regions: metal-coated regions that contact the electrodes for electrical connection, and exposed regions that interact with nucleotides. This segmentation allows each region to be optimized for its specific function while simplifying the overall manufacturing approach
Solution Approach 2:
Different regions of the polymer bridge have different properties: the metal-coated regions provide electrical conductivity and stable electrode contact, while the exposed regions provide nucleotide binding capability. This local differentiation of properties enables both electrical signal detection and biochemical functionality without requiring complex manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a robust, reproducible, and sensitive sequencing process that detects single molecules with high throughput, reducing the risk of current-induced damage and improving stability and accuracy compared to traditional methods.
Implementation Method 1
a first metal-coated region contacting the first electrode, a second metal-coated region contacting the second electrode
Implementation Method 2
detection circuitry to detect a sequence in which the polymerase adds the nucleotides to the first polynucleotide using at least changes in an electrical signal through the bridge. The changes may be responsive to contact between the labels corresponding to those nucleotides and the exposed region
Data Source
AI summary
Provided herein are compositions and methods for sequencing using metal-coated polymers. In some examples, a bridge spans a space between first and second electrodes and includes a polymer chain having a first metal-coated region contacting the first electrode, a second metal-coated region contacting the second electrode, and an exposed region located between the first and second regions. The composition includes first and second polynucleotides; a plurality of nucleotides, each nucleotide coupled to a corresponding label; and a polymerase to add nucleotides of the plurality of nucleotides to the first polynucleotide using at least a sequence of the second polynucleotide. The composition includes detection circuitry to detect a sequence in which the polymerase adds the nucleotides to the first polynucleotide using at least changes in an electrical signal through the bridge, the changes being responsive to contact between the labels corresponding to those nucleotides and the exposed region.